Gravity separator for garnet ores



July 5,1927.

F. B. BURNS GRAVITY SEPARATOR FOR GARNEfE-ORS Filed April 27. 192e 2 sheets-sheet 1 ya 5d 3/35 Srl/wanton mur , 1,635,111 F. B. BURNS GRAVITY sEPARATon Fon GARNET ons Filed April 27, 192e 2 sheets-sneu 2 'July 51, 1927.

/ gwnoi /-Bu-ns Strom Patented July 5,1927. if

UNITED STATES FRANcIs B.,BURNs, OENORTH RIVER, ,NEW YORK.`

.GRAVITY SEPARATOR. FOR GARNET CRES.

This invention relates to ore separators of that character wherein a jigging screen is disposed within a hutch and the general object of the present invention is to provide a separator of this character-which is particularly adapted for the separation of garnets from `crushed ore.

Another object is to provide a separator of this character having a screen disposed within a hutch and upon which screen the Vore is discharged and provide means wherebythe screen may be given an oscillatingmotion in a vertical plane withinthe hutch and' also whereby the screen may be inclined laterally to cause a compound motion to be given to the screen.v

A further object is to provide means at the end of the screen whereby the tailings may be permitted to pass and therelatively 'coarse rock and garnets are held from passage with the tailings or, in other words, held upon the screen while the lines pass down through the screen.

Still another 'Objectis to support the pivotal end of the screen upon bearings which will permit the vertical oscillation of the screen but which may be'also adjusted to cant the screen at an angle sidewise;

Other objects will. appear in 'the course of the following description.

My invention is illustrated in the accompanying drawings wherein T i Figure 1 is a front elevation of a separator constructed in accordance with my invention,one side of the 'separator being in section;` V

Fig. 2 is atop plan view of the separator;

Fig'. 3 is a section on the line 3-3 ofFigure 2 ;y

Figa is `a fragmentary vertical section on the line L1 1 of Figure 3.' Y

Referring to these drawings 1() designates a tank, which, as illustratechis divided into two portions or hutches 11 by a vertical partition A12. I VVdo not wish to be limited toxthis, however, inasmuch as' I have only .provided this construction so as to econoi'nize in room and permit two screening devices to be disposed side by side. (The bottom 18ct' each hutch l1 extends horizontally from the partition l2 and then extends upward and outward and Athis upwardly and outwardly extending portion or wall is provided with a discharge opening or gate 14. 1

Extending upward from the rear wall of the tank 110 lare brackets' lfwhich lsupport Application filed A131112?, 1926. Serial No. 104,994.

.a driving shaft 16 carrying a pulley V1'? whereby power may be transmitted to it. Mounted upon the shaft `16 are eccentrics 1S having the usual two-part eccentric straps 19 from which depend the screen supporting rods 2O having their upper ends screwnrea'ded for engagement in the straps and carrying the nuts 2l.

Disposed in each hutch is a screen consisting of the rear transversely extending member 22 andthe two longitudinally extending parallel members 23, these members 22 and 23 constituting a rectangular frame which is open at one end. The rods 2O have screw-threaded engagement at their lower ends with the end member 22 so that this end member may beadjusted up orl down upon' the rodsand the screen is held in its adjusted position by lmeans of the nuts 21. The bottom of the screen frame is'formed by the linely meshed ,screen 24, held in place by strips 25, these in turn being held to the side lmembers 23 by the clips 26, as shown in Figure 1.

The front wall 27 of each hutch is cut away as at 2S opposite the end of each screen, this cut away portion being larger than the cross sectional area of the screen and attac-hed in anysuitalole manner to the edge Ashaft 30' is .disposed within a bracket 32 mounted upon the outside wall of the hutch. This bracket has a recess 33 in the-upper face within which the squared'end of the shaft 30 is disposed. One wall of each bracket is formedwitha vertically extending slot 34 and an adjusting screw 35 constituting a' clamp passes rvthrough this slot and Y is screwed into engagement with Vthe squared end of the shaft 30.

i Extending vertically through the shaft 30 is an adjusting screwl 36 whichbears against the floor of the recess S3 and thus it will be seen that as this screw-36 is turned, the vother end of the shaft 8O maybe' raised or lowered slight amount and thatithe shaft may be soY thus disposedat anv inclination 'to a hori- Screen.

Zontalplane. The opposite end of the shaft 30 is pivotally mounted within a bracket 37 which is longitudinally recessed to receive the squared end 3S of the shaft and a pivot bolt 39 or like member passes through the side wall of the recess and through this squared end so that the shaft 30 at one end is pivotally mounted and at the other end is vertically adjustable.

Disposed at the tail or discharge end of thescreen an overflow gate or dam designated d0. This has a downwardly and forwardly inclined upper face which contacts with the screen frame at its forward edge. The rear end of this gate or dam extends downward as at ll into contact with the screen, Extending acrossthe screen frame and resting upon the side members thereof is a cross bar l2 and passing upward through the overflow gate a0 are bolts i3 which pass vthrough the cross bar and carry the mits Llei.

By this means the overiiow gate or dam may be adjusted to raise or lower it.

The crushed ore is fed onto the screen from a storage bin by means of a spout l5 or any other suitable means to this end. and discharged upon the Ascreen about the middle thereof. The water tank of each hutch must have a continuous flow of water passing through it and keeping it filled to a suitable height ywith relationto the screen. The eccentric shaft 16 is driven at from 230 to 320 R. P. M., and this causes a jigging motion of the screen frame. The jigging motion of the screen under the action of water causes the liner particles of ore to pass through the The refuse or tailings are discharged over the overflow dam or gate while the oversize collec-ts in the front end of the screen frame in a quantity large enough to be shoveled out at intervals. rlhe very fine particles which pass through the screen into the hutch sett-le in the bottom thereof and are discharged through the discharge gate and from thence pass to another separator preferably of the same character as the one just described which7 however, has a finer meshe'd screen. Itk will require about four machines in a row, each screen being finer than the one in advance, in order to secure a proper clean-up of the material.

Both of the eccentriesV may be set at the 'same angle and have the same throw andV move'precisely together. By adjusting the rods 20 the screen may be raised or lowered. By adjusting the shaft30 yand by properly adjusting the rods 20 so as to lengthen one with respect to the other, the screen may be readily leveled by means of the screw 36.

l/Vhile l have illustrated a construction which I have found to be particularly effective.l do not wish to be limited thereto as it is obvious that many changes might be made `therein without `departing from the spiritlongitudinal movement oi' small dimensions.v

This is for the reason that the tail end of the screen is swingingly f mounted on the gears 3l so that as the rear end orhead end of the screen rises and falls, thel forward end of the screen will swing backward and forward. Thus, when the head end igs up andA down, the screen will be .moved sligh tly endwise. This motion is very important in `moving garnets toward the head or ljigging end of the separator. vWhen the separator is in operation, the head end is always elevated above the tail end. The coarse ore requires more tilt than finer oresl and thus by adjusting therods '20, the proper elevation of the screen can be maintained, as conditions change with the ore. f By adjusting one of the rods 2O to the inclination` of shaft 30, the screen an always be kept level crosswise and this may be done wit-hout stopping` the machine or feed bybacking off the nut on top of the vscreen and following up with the nut on the bottom ofi the screen. This, of course, accounts for efficiency.

rlhe cap screw 35 is designed to hold the shaft 30 rigidly against the wall or bracket 32 after adjustments haveV been made;

rlhe adjustment of the shaft 30 by means would have to be lshut down and lscreen leveled up and bearings reba-bbit-ed vor relined7 the operation taking about five hours. lVith the shaft 30 pivoted at one end and adjustable at the other end and two cams with their rods 2O support-ing the other end of the screen, the screen frame cannot-'always be kept level crosswise and the machine may be constantly adjustedl to secure this level by letting one end of the shaft 30y down or raising it and by correspondingly adjusting one of the eccentric rods,'and thus the Ascreen may be leveled without stopping the machine or stopping the feed7 this operation only requiring one or two minutes. To secure aproper separation of the garnets from the garnetore it is particularly important that the screen be level transversely.V f Y Itis to beparticularly noted that this machine Adoes not operate automatically, as an automatic separation with garnetore'is im-V CII difficult ore to separate. vWith automatic separators, after they are adjusted to the proper point of separation, this adjustment must be maintained, as if it is not maintained, there is liability of getting dirty concentrates and loose garnets in the tailings, thus causing a low recovery. In other words, after adjusting an automatic separator, the feed must run even, the ore must yrun uniform in quality, and the water must be uniform in amount. It is impossible to secure these prerequisites in concentrating garnet ores. While vmy garnet separator will make a clean conCent-rate and discharge a clean tailing, the concentrates have to be shoveled out of the screen at intervals according to the amount of ore being treated and conditions can fluctuate to a wide range without affecting the separation. This is -due to the fact that the machine does not work automatically but permits the concentrates to be shoveled out of the front end at intervals according to the amount of ore being treated. In my .machine the concentrates are gathered at the rear of the screen, that is, close to the rear crossbar 2Q, the middlings gathered slightly forward of the feed spout, while the tailings are discharged over the gate 40.

My separator is particularly adapted to garnet bearing ores because it has secured in actual practice, a 95% recovery, making a clean concentrate and discharging a clear tailing. The separator has a relatively large capacity under varyingconditions and this is particularly necessary owing to the small" margin in weight between garnet concentrates and garnet bearing ores.

I claim 1.*An ore separator of the character described including a tank having a discharge gate in its bottom, a screen'frame open at one end and carrying a screen, the open end of the screen discharging through an end wall of the tank, power operated means for giving vertical oscillation vto the tank, and

including two vertically reciprocable rods connected to that end of the screen relnote from its discharge end, they screen being connected to each rod for vertical adjustment, a transversely extending horizontal support for the discharge end of the screen pivotally mounted at one end and means for vertically adjusting the other end of the pivotal support to thereby adjust the screen in a j vertical pla-ne.

2. An ore separator of the character described includlng a tank, a screen therein including a screen frame open at one end and a screen attached to the bottom of the screen frame, the open end of the screen frame being flexibly connected to the end wall of the tank, a shaft disposed above the rear end of the screen and carrying eccentrics, eccentric .straps mounted thereon, adjustable rods connecting said straps to the rear end of thescreen frame, each of said rods being adjustable independently of the other, and means forpivotally supporting the forward end of the screen including a shaft, hangers mounted thereon and engaging the forward end of the screen frame, and means for pivotallj7 supporting one end of the shaft, and vertically adjustable means for supporting the other end of the shaft.`

3. An ore separator of the character described vincluding a tank, a screen therein including a screen frame open at one end and a screen attached to the bottom of the screen fr-ame, the open end vof the screen fra-me being flexibly connected to the end wall of the tank, a shaft disposed above the rear end of the screen and carrying eccentrics, eccentric straps mounted thereon, adjustable rods connecting said straps to the rear end of the screen frame, each of said rods being adjust-able independently of the other, and means for pivotally supporting the forward end of the screen frame comprising a transversely extending shaft, hangers loosely embracing the shaft and connected to the screen frame, a bearing having a recess within which one end of the shaft is inserted and to the walls of which the shaft is pivoted, a second bearing having a vertically disposed recess within which the corresponding end ofthe shaft is disposed, and an adjusting screw passing vertically through the shaft andengaging the bottom of said recess whereby this end of the shaft may be raised or lowered, y f

4. AV garnet ore separator including a tank, a screen frame openat one end and carrying a screen, the open end of the screen being flexibly connected to the end wall of the tank, a transverse shaft mounted upon In testimony whereofv I hereunto aHixmysignature.

FRANCIS B. BURNS. 

